Nuclear Theory·nucl-th

Friday·January 15, 2021

6 papers—4 primary·2 cross-listed

01
Symmetry energy effect on the secondary component of GW190814 as a neutron star
Xuhao Wu🇨🇳 · Shishao Bao🇨🇳 · Hong Shen🇨🇳 · Renxin Xu🇨🇳
The secondary component of GW190814 with a mass of 2.50-2.67 $M_{⊙}$ may be the lightest black hole or the heaviest neutron star ever observed in a binary compact object system. To explore the possible equation of state (EOS), which can support such massive neutron star, we apply the relativistic mean-field model with a density-dependent isovector coupling constant to describe the neutron-star matter. The acceptable EOS should satisfy some constraints: the EOS model can provide a satisfactory description of the nuclei; the maximum mass $M_{TOV}$ is above 2.6 $M_{⊙}$ ; the tidal deformability of a canonical 1.4 $M_{⊙}$ neutron star $Λ_{1.4}$ should lie in the constrained range from GW170817. In this paper, we find that the nuclear symmetry energy and its density dependence play a crucial role in determining the EOS of neutron-star matter. The constraints from the mass of 2.6 $M_{⊙}$ and the tidal deformability $Λ_{1.4} = 61 6_{- 158}^{+ 273}$ (based on the assumption that GW190814 is a neutron star-black hole binary) can be satisfied as the slope of symmetry energy $L \leq 50$ MeV. Even including the constraint of $Λ_{1.4} = 19 0_{- 120}^{+ 390}$ from GW170817 which suppresses the EOS stiffness at low density, the possibility that the secondary component of GW190814 is a massive neutron star cannot be excluded in this study.
nucl-thastro-ph.HEPRC(2021)·25 citations
02
Transfer reactions between odd-odd and even-even nuclei by using IBFFM
Ruslan Magaña Vsevolodovna · Elena Santopinto · Roelof Bijker
Spectroscopic Amplitudes (SA) in the Interacting Boson Fermion Fermion Model (IBFFM) are necessary for the computation of $0 ν β β$ decays but also for cross sections of heavy-ion reactions, in particular, Double Charge Exchange reactions for the NUMEN collaboration, if one does not want to use the closure limit. We present for the first time: i) the formalism and operators to compute in a general case the spectroscopic amplitudes in the scheme IBFFM from an even-even to odd-odd nuclei, in a way suited to be used in reaction code, i.e., extracting the contribution of each orbital; 2) the odd-odd nuclei as described by the old IBFFM are obtained for the first time with the new implementation of Machine Learning (ML) techniques for fitting the parameters, getting a more realistic description. The one body transition densities for $^{116}$ Cd $\to$ $^{116}$ In and $^{116}$ In $\to$ $^{116}$ Sn are part of the experimental program of the NUMEN experiment, which aims to find constraints on Neutrinoless double beta decay matrix elements.
nucl-thnucl-exPRC(2022)·8 citations
03
Properties of the QGP created in heavy-ion collisions
P. Moreau🇺🇸 · O. Soloveva🇩🇪 · I. Grishmanovskii🇩🇪 · V. Voronyuk🇷🇺 · L. Oliva🇩🇪 · T. Song🇩🇪 · V. Kireyeu🇷🇺 · G. Coci🇩🇪 · E. Bratkovskaya🇩🇪
We review the properties of the strongly interacting quark-gluon plasma (QGP) at finite temperature $T$ and baryon chemical potential $μ_{B}$ as created in heavy-ion collisions at ultrarelativistic energies. The description of the strongly interacting (non-perturbative) QGP in equilibrium is based on the effective propagators and couplings from the Dynamical QuasiParticle Model (DQPM) that is matched to reproduce the equation-of-state of the partonic system above the deconfinement temperature $T_{C}$ from lattice QCD. Based on a microscopic transport description of heavy-ion collisions we discuss which observables are sensitive to the QGP creation and its properties.
nucl-thAstron.Nachr.(2021)·15 citations
04
Hadron yields in central nucleus-nucleus collisions, the statistical hadronization model and the QCD phase diagram
A. Andronic🇩🇪 · P. Braun-Munzinger🇩🇪 · K. Redlich🇵🇱 · J. Stachel🇩🇪
The description of hadron production in relativistic heavy-ion collisions in the statistical hadronization model is very good, over a broad range of collision energy. We outline this both for the light (u, d, s) and heavy (charm) quarks and discuss the connection it brings to the phase diagram of QCD.
nucl-thActa Phys.Polon.Supp.(2021)·14 citations

Affiliations

first authorsco-authorsvia INSPIRE

Symmetry energy effect on the secondary component of GW190814 as a neutron star

Transfer reactions between odd-odd and even-even nuclei by using IBFFM

Properties of the QGP created in heavy-ion collisions

Hadron yields in central nucleus-nucleus collisions, the statistical hadronization model and the QCD phase diagram

Affiliations